Finding the Fourth Proportional to 123,158.26, 169,960.29 and 72,158.79

Step by Step Solution

1. Step 1: Write the proportion equation
   123,158.26 : 169,960.29 = 72,158.79 : x
2. Step 2: Convert to fraction form
   123,158.26/169,960.29 = 72,158.79/x
3. Step 3: Cross multiply
   123,158.26x = 169,960.29 × 72,158.79
4. Step 4: Simplify right side
   123,158.26x = 12,264,128,874.45
5. Step 5: Solve for x
   x = 12,264,128,874.45/123,158.26
6. Step 6: Final answer
   x = 99,580.24